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There are a few differences between WPF on Windows Vista and WPF on earlier versions of Windows. The following two features are unique to Windows Vista: 3D objects get anti-aliasing only on Windows Vista or newer, and nonrectangular or translucent windows get hardware acceleration (from your graphic card s GPU) only on Windows Vista or newer.
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Many other videos and presentation and learning tools are available at the same Web site. See http://sessions.visitmix.com/.
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Extensible Application Markup Language (XAML), pronounced zammel, is a grammar of XML that enables declarative programming in WPF. It is called declarative programming because, by using XAML, a developer can define the user interface declaratively, similar to how an XML file describes a document format. It is a programming language because you can create .NET objects by simply using XAML.
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6: Modifying Your Web Browser
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A good analogy is the new 2007 Microsoft Office system s document format that uses XML to describe the structure and formatting of your Word 2007 documents, for instance. XAML enables something that was really difficult previously: designers and developers working together on the same project. With Visual Studio and Microsoft Expression products such as Microsoft Expression Blend, designers can work on the design and user interface and then pass them on to the developers who can write the code. The video referenced previously is a good example of how these separate tasks can come together. Using XAML simply helps separate the front end, or user interface, from the back end, or business logic. I don t want to get too deep into XAML at this point because that s not the purpose of this book, but we ll start by looking at how XAML defines real .NET objects. Here s how a button is declared in XAML:
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<Button xmlns= http://schemas.microsoft.com/winfx/2006/xaml/presentation Name= btnGo >Go</Button>
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If you place this code in a file called Foo.xaml and then fire up Internet Explorer and open this file, you ll see a big button that takes the entire surface, but it s a real WPF button. You don t need to compile the code, and it works. Isn t that great This means you can write applications that define your interface and then add events such as the Click event and have the code in a separate Visual C# file; however, it also means it can t run by itself in a browser. It would look something like this:
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<Button xmlns= http://schemas.microsoft.com/winfx/2006/xaml/presentation Name= btnGo Click= btnGo_click >Go</Button>
WARNING
The goal here is to show how you would create an application in WPF, but Windows Forms is still easier to use and the way to go unless you are willing to spend some time learning WPF concepts, learning XAML, and working more with the code.
So, you now see clearly the separation between the user interface definition and the business logic of your application.
TO CREATE A WPF VERSION OF THE BROWSER
This is an introduction to WPF, so we won t reimplement the whole application here; instead, I ll show parts of the Web browser application but with a reduced set of features. In fact, we will implement almost the same version as in 4.
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You ll first define the interface, and then you ll hook up the browser events so that it actually works: 1. Add a new project to your solution by clicking File, Add, New Project. Select the WPF Application template from the Visual Studio templates, and name it MyOwnWpfBrowser. Your screen should look like the one in Figure 6-15. Then click OK to create the project.
Figure 6-15 Adding the WPF browser project to your solution
You should now have the new designer surface and XAML editor in a split view on your screen. Look at Figure 6-16 for the new WPF design experience. You ll also notice that the Properties window has changed quite a bit.
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